shipment is not handling errors

[Majklas]

Getting lots of errors on not handling bad responses, like:
PHP Fatal error: Uncaught ProductFlow\KauflandPhpClient\Exceptions\KauflandException: Kaufland error: {"message":"Validation Failed","errors":[{"field":"error_code","message":"order_unit_already_marked_as_sent"},{"field":"id_order_unit","message":XXXXXXXX}]} in /var/www/public_html/XXXXX/productflowbv/kaufland-php-client/src/Connection.php:122

when using : $kaufland->orderUnit()->send($v['id_order_unit'],$itm);
could we fix them? Or at least show how to make it work and skip such errors?